diff --git a/leetcode/7.py b/leetcode/7.py
new file mode 100644
index 0000000..2ae721a
--- /dev/null
+++ b/leetcode/7.py
@@ -0,0 +1,18 @@
+# Reverse Integer
+
+
+class Solution:
+    def reverse(self, x: int) -> int:
+        str_x = str(x)
+        reverse_str_x = str_x[::-1]
+        if reverse_str_x[-1] == "-":
+            reverse_str_x = "-" + reverse_str_x[:-1]
+        return int(reverse_str_x)
+
+
+if __name__ == "__main__":
+    x = 120
+    rev_x = Solution().reverse(x)
+    print(rev_x)
+    x = -123
+    print(Solution().reverse(x))